Valve-gear for descending automobiles.



H. SAURER.

VALVE GEAR FOR DESCENDING AUTOMOBILES.

APPLICATION FILED AUG. 28, 1906.

Patented Sept. 21, 1909. 2 sums-sum 1.

ILSAURER.

VALVE GEAR FOR DESGENDING AUTOMOBILES.

APPLIOATION IILBD AUG. 28, 1905.

Patented Sept. 21, 1909. 2 SHEETS-SHEET Z.

l/Fir$5594595555411 err sT ear -11 @FiQE.

EIPPOLY'I SAURER, 0F

ARIBON, SWITZERLAND.

To all whom it may concern:

Be it known that I, Hirronvr SAURER, a citizen-of the Confederation of Switzerland, residing at Arbon, in Switzerland, have mof which the fol- In my application of November 22, 1904, for a U. S. patent, Serial No. 233870, I have described .a method of regulating descending automobiles and a valve gear therefor. 'ThlS method of regulating the speed of an automob le having a four stroke cycle explosion motor during long descents consists'in stopping the supply of the driving medium and the igniting device, allowing I will now the inlet valve or valves to work as usual, and so changing the outlet cam or cams on the am shaft as to cause the outlet valve or valves to open and admit air during the whole or a part of the respective thirdpiston strokes, so that theair'is compressed during the second piston strokes and during the whole or a part of. the fourth piston strokes for retarding the vehicle.

Mynvention relates to another valve gear for obtaining a similar'resultwithout changing the outlet cam. or cams on the cam shaft. roceed to describemy' invention with r'e erence. to the accompanying drawings, in Wl 1ich,

Figures'l to 3 are diagrams, which will be referred to later on, Fig. his a longitudinal section through apart of a cylinder, its'outlet valve,box,'the cam shaft and the controlling shaft, an intermediate part being omitted and the outlet valve with its rod,

{the-roller with its rod and lover being shown 5O ing each outlet cam 'bn the cam shaft. Fig.

in elevation, an enlarged Fig. 5 is a part out ofFig. 4 on scale and shows'difierent positions of the outlet cam, the roller, the rod and the lever on the controlling shaft, and Fig. 6

shows a modified outlet camfon the cam shaft.

*Similar'charactem of reference refer to.

similar parts throughout the several views.

Figs. 1 to 3 are reproduced from the above illustrate the in w iich the spee'dof the descend- 1 represents for example a cross section through an ordinary camshaft .1 of 'a four stroke cycle explosion motor immediately before the inlet cam-2, while Fig.2 is a cross section through the samecam shaft Specification of Letters Patent.

MtoN.

1 immediately before the outlet cam 3, the cam shaft 1 occupying the same position in both Figs. 1 and The cam shaft 1 is driven from the crank shaft 7 in Fig. 3 at the rate of 2:1 as usual, that is to say, it makes but one revolution on every two revos lutions of the crank shaft 7, the gear wheel or bevel wheel being indicated by the dotted circle 4:. The two cams 2 and 3am assumed to act upon the inletvalve andthe outlet. valve respect'iwly by means of two rollers 5 and In general the two cams 2 and 3 are difierent in size or shape. In Figs. 1 and 2 the cam shaft 1 is assumed to turn in the direction of the arrow 8 and in Fig. 3 the crank shaft 7 in the same direction, 2'. e. that of th'e arrow 9, but it will be understood, that these directions of revolution may be different according to the circumstances. lVhen a point on the gear wheel 4: moves from G through an angle of 90 to H, then the crank pin will move in the same time through an angle of 180, for example from I through 0 to L. The two cams 2 and 3 are normally so disposed, that during the revolution of the said point on the gear wheel 4 from G to H the inlet cam 2 will lift the roller 5 and thereby open the inlet valve and that during the revolution of'the same point from K to G the outlet cam3 will a. revolution of the cam shaft 1 and during the fourth piston stroke or during the second path of the crank pin from L through When the automobile is descending on a steep road, both the supply of the gas or other driving medium device are stopped and according to the application mentioned above the outlet cam 3 is so turned in the direction of the arrow 8 through an angle of about 80 or 90 as to bring it into the position indicated by the dotted lines in Fig. 2. Then air will be admitted by the inlet valve with the aid ofthe inlet cam 2 and the roller 5 during the first quarter of a revolution of the cam shaft 1 or during the first piston stroke or during the first path of the crank pin from N through 0 to L. Afterwardair will also be and the igniting Patented Sept. 21, 1909. Application filed August 28. 1805. Serial No. 276,183.

admitted by'the outlet valve with'the aid of the outlet .cam'3 and-the roller 6 during the I thirdquarterv 'of 'a revolution of- ;the' cam shaft=1...(thesaid point on the gear wheel .4} describing the path from I to K') orduring the third piston stroke or; during the second path ofthe c'rankpinfrom Nthrough-'O1to.-

. L'Jfii'The consequencewill be, that the air is compressed not only during the secondpis- .tonstroke', but also during the fourth piston stroke, e.-once during each revolution of thecrank shaft 7, so that the pressure of the compressed ,air acting upon the crank? pin will retard the .vehicleand prevent it from ri'inning-fast.- 'In'case the road is not very steep, of course the outlet cam 3 need not 'be' changed through the. entire angle'from the position shown by the full lines'in Fig. -2-t o' theother: position indicated by the-dotted lines. Then air willbe admitted during the .first piston stroke and during a part of the. third piston'stroke and compressed during the secondpiston stroke and during a part of thefourth piston stroke, so. that the pres? 'sure of thecompressed air is'larger at the endof the second piston stroke than at the end of the fourth piston stroke. By varying the angle, through which the'outlet cam 3 is turned from its normal position shown by the'full lines at Big. 2 the speed of the descending vehicle can be regulated; For attainingthisobject according to the application-mentioned above the inlet cams were- -arranged .on a special cam shaft and the outlet cams on another cam shaft, which latter can be displaced with regard to the first cam shaft by, means of 'a special mecb anism.

According tomy present invention a single cam shaft 12, Figs. 4 and 5,. is employed,

on which both the inlet and the outlet cams.

are fastened. As the inlet valves are working in the usual manner, they are left out of' consideration, while an outlet .valve 13 is shown in Fig. 4'. Its spindle 14;is mounted in' suitable guides 15 and. 16 -of any known construction to movelongitudinally. The

'cani shaft, 12 is driven from the crank shaft (not shown) in any known manner at the rate of 2:1 as usual and stated above. Parallel with the cam. shaft 12a controlling shaft 17 is mounted in suitable bearings (not shown) to turn. It is to be connected in any known manner with a controlling handle 33 within the reach of the driver, for exusual. In Fig. 4' the several inlet,an-d..'out- --be assumed to .be incl'osed'in ajcasing 18, of course this is quite immaterial. On'-'th elearness only one outletcam-20 shown as rod 21 is pivotally connected with the lever 19 by means of a pin 22*and carries near'it's other end a' pin 23, on which aroller 24 is mounted to turn. This roller- 24 v may be assumed to engage in a recess 25 of the. rod 21, but this construction is quite immaterial. The lower end of the valve spindle 14 is adapted to ride upon the rod'2'1, which'can' be moved horizontally by means of theleve'r eral the lower end of the valvesp'indle 14 only during the time, when it is being lifted by the outlet cam 20. When the part-s19, 21 and 24 occupy the middleposition shown .by the'full lines, there-will be a little cleartime left between the rod 21 and the valve spindle 14 during the" time in. which the roller 24 runs on the concentric part 'of the smallest radius of the cam 20, since the outlet valve 13 is supported by its seat. In case right or the left extreme position-indicated by the dottedlines, of course there willlbe a valve spindle 14' duringthe time in which will be clear from an examination of Fig. 5.

to3and Fig. 5, the cam shaft 12 is assumed town in the same direction as in Figs. 1

In Fi 5 the outlet cam 20 is shown in further. The position of the outlet cam-20 the middle-position of the parts 19, 21 and 24. The two other positions. of the outlet lines correspond with the two extreme positions of the parts19, .21 and 24 indicated by the similarly dotted lines. The. angle a "formed by -the two extreme positionsshown but it may be varied at pleasure by proportioning the amplitude of the angle 6, the length of thelever 19 and the-rod 21,- the diameter of the roller 24, the size and shape ofthe outlet cam 20 and the relative position of the cam shaft 12 and the controlling controlling shaft 17. as nrlany'j;levers-19- are secured in the samepl-ane 'passing' through 1 the-axis of the shaft, as there, are outlet cams-on the cam shaft 12. Forv thesakeof 1 fastened. on the'cam shaft 12. A' horizontal greater clearance between the rod 21 and the l the roller 24 runs on the saidconcentric.

part of the smallest radius of. the'cam '20,'as

For makinga comparison between Figs. 1

three different positions, in which it ceases; to lift the outlet valve 13, so that the latter, closes and the rod 21 will leave the valvespindle 14 on the cant shaft 12 turning 15 shown by the full linesicorresponds with a cam 20 indicated by the differently dotted.

of the outlet cam 20 happens to be 40 10',

:12 at-certain angles from each other as let cams and part of the c'anrshaft'12 may 19 in the manner. described above. In gen isnot always in contact with the rod 21, but v p the parts 19, 21 and '24 occupy either the and 2, i. e. in thedirection of the arrow 26.

fication of the outlet cam 20.

The valve gear described operates as follows: Normally the controlling handle near the drivers seat is so adjusted as to bring all the levers'19 'on the cgntrolling shaft17 into the extreme left position indieated by the dotted lines in Fig. 5. In this position all the levers 19 are left, as long as the automobile stops ,orruns either on horizontal roads or uphill on inclined roads. The motor is started and stopped in the usual manner with the aid of the respective known devices. F rom an examination of Fig. 5 it will.be evident, that during the work of shaft 17. F Fig. 6 shows for example a modii the motorv the outlet-cam 20 for either cylinder 27 will lift the roller '24 with the rod 1 21 and the valve spindle l l during the fourth piston stroke to open the outlet valve 13, so that the products of the explosion are allowed to. escape'from the cylinder'27 past the outletvalve 13 through the tube 28 and any tube (not shown). adjoining to the flange 29 into the atmosphere. When a circle concentric with the cam sh'aft'12 is drawn through the" point of contact 0 between the-cam 20 and the roller 24, it will be found, that in thiscircle c -J the cam 20' of the shape shown covers an angle of nearly.90. VV'heIi the vehicle descends and its'speed requires to be regulated with the aid of compressed air, the supply of the driving medium is' stopped and the igniting device rendered inactive, while the cont-rolling lever near the drivers seat 'is turned through a convenient angledetermined by experience or trials in accordance'with the angle of inclination of the road and then secured 1n its new position. Thereby the parts 19, 21 and 24 may be assumed to be' brought for example into the middle position shown by the full lines in Fig. 5. On

drawing a circle (not shown) concentric with the camshaft 12 and through the new point of contact e, it will be found, that the point of intersection f of this circle with the other side of the cam 20, that is the point of contact, in which the cam 20 commences to lift the'roller 2 1, is distant from the previous point of contact (Z by an angle of about 4c5. When assuming the outlet cam 20 to normally commence to lift the outlet valve at K in Figs. 1 and 2, this would mean, that now the outlet cam 20 would commence to lift the outlet valve 18' at a point between I and K, which is distant from K by an angleof 45. I Inother words, the outlet cam 20 would commence to open the outlet valve 13 at the middle ofthe third piston stroke and close the valveat a certain point near the end of the fourth piston stroke (the point of contact 6 being at an angle of about'l5"- from the previous point of contact 0). Or if the parts 19, 21 and 24 are brought into the'extreme right 'positionjin'dicated by the dotted lines, it will v close it after the'piston has traveled through more than half its" fourth stroke. 'llhen air will be fully compressed during the second piston stroke and partially during the fourth piston stoke, whereby of course the vehicle is retarded and prevented from running fast. Itis true, that the valve. gear as illustrated in the drawings is not capable of attaining the maximal effect as described in. my said application, viz. the admission of air during the whole third piston stroke and the compression of the air during the whole fourth piston stroke, but in many cases the new valve gear will be found to answer the purpose.

The valve gear described may bevaried in many respects without deviating from the spirit of my invention.

WVhat I: claim as my invention, and desire to secure byLetters Patent, is

1. In a four stroke cycle explosion motor for automobiles, means to retard the speed of the motor when the automobileis running by momentum or gravity and the supply of the explosive medium is stopped, the said means comprising a shifting device with a roller interposed between the stem of the outlet Valve and the cam for actuating the same and the roller being adapted to roll on the cam, and means under the control of the driver for varying the position of said shifting device.

2. In a four stroke cycl explosion motor for automobiles, the combination with a. cylinder and its outlet valve and valve-stem, of a shaft provided with a cam for actuating said valve, a bar carrying a roller intermediate of said cam and stem, and means under the control'of the driver-for adjusting by said bar the position of said roller which is adapted to roll on said calm-whereby this cam may be caused to open said valve to admit air during the third stroke of the piston in the cycle, so that the air can be compressed during the fourth piston stroke for retarding the motor when the automobile is running by momentum or gravity anchthe supply of the explosive medium is stopped.

3. In a four stroke cycle explosion motor for automobiles, the combination with the outlet valves and their stems, of a shaft pro vided with cams for actuating said valves,

bars with I rollers interposed between said cams and said stems and'the rollers being ada tedto roll on the cams, and a rocking sha t under the control of the driver and carrying arms which are pivotally connected with said bars, whereby said rollers may be shifted to cause said outlet valves to be opened for admitting air during the .third stroke of the pistons in the cycle, so tliatthe air can be compressed during the fourth piston stroke for retarding the motor when the automobile is running by momentum ;or.'

gravity and the supply of the' explosive medium is stopped.

ls-In a four stroke cycle explosion motor for automobiles, the combination with a cylinder, its voutlet valve and valve stem, of a shaft provided with a cam, mechanism interposed between the shaft and the valve stem and acted on by the cam 'to normallyopen the outlet valve during the fourth 'stroke of the cycle for the'outlet' of spent gases, and manually operable means for shifting said mechanism to cause it to open the outlet- I automobiles, the combination with a cylin der, its outlet valve and vertical valve stem, of a shaft provided with a cam and adapted to be rotated two revolutions to one of the engine. crank shaft, a controlling shaft adj acent to and parallel with the cam shaft, a lever fixed to said controlling shaft, a hori- 1 zontally movable bar pivotally connected to said leverand disposed intermediate the cam and the lower end of' the valve stem, said arm adapted to-lraise the valve stem when controlling shaft in either direction through a certain angle and adjusting it.

6. In ,a four cycle explosion =motor for automobiles, the combination with a cylin- 'der and its outlet valve and valve stem, of a shaft providedwith a cam, a controlling shaft adjacent to and parallel with said cam shaft, a lever fixed to said controlling shaft and disposed upright thereto, a horizontal bar pivotally connected to said lever and disposed intermcdiate saidcam and the lower end of the valve stem, said bar adapted to lift the valve stem when acted on by the cam of the cam shaft, a roller carried by said arm and adapted to roll on said cam, said controlling shaft adapted to turn whereby to laterally adjust the horizontal arm,'a second lever on said controlling shaft, and means for manually operating said second lever, whereby to operate the controlling shaft.

In testimony whereof I have-signed my name to this specification in the presence of two subscribing witnesses;

'HIPPOLYT SAURER.

lvitnessesz C. A. Boss, 7 IIERNANDO DE 'Soro. 

